ox-ravel.org: Allow filters in `org-ravel-define-exporters'
ox-ravel.org: Allow filters in `org-ravel-define-exporters'

* ox-ravel.org (org-ravel-define-exporter) The `filters' arg - if
  given - provides an alist of filters that will be added to the
  ravel backend.

The 'ravel-markdown backend now uses this to provide a filter that
transforms "\cite{id}" to "[@id]" as pandoc uses.

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